CN1904764A - Fixing unit and image forming apparatus having the same - Google Patents
Fixing unit and image forming apparatus having the same Download PDFInfo
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- CN1904764A CN1904764A CNA2006101078973A CN200610107897A CN1904764A CN 1904764 A CN1904764 A CN 1904764A CN A2006101078973 A CNA2006101078973 A CN A2006101078973A CN 200610107897 A CN200610107897 A CN 200610107897A CN 1904764 A CN1904764 A CN 1904764A
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- 230000002787 reinforcement Effects 0.000 claims description 86
- 238000010438 heat treatment Methods 0.000 claims description 22
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 238000007639 printing Methods 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 238000010023 transfer printing Methods 0.000 claims description 4
- 239000012943 hotmelt Substances 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007600 charging Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/206—Structural details or chemical composition of the pressure elements and layers thereof
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- General Physics & Mathematics (AREA)
- Fixing For Electrophotography (AREA)
Abstract
A fixing unit, and an image forming apparatus having the fixing unit. The fixing unit includes a heat roller including a heat source therein, one or more pressing rollers in close contact with the heat roller, an elastic body to elastically apply pressure on both ends of the one or more pressing rollers with respect to the heat roller, a backup member to contact a central portion of the one or more pressing rollers and to apply pressure to the central portion in a longitudinal direction of the one or more pressing rollers, and a backup elastic body to elastically press the backup member towards the heat roller.
Description
The application requires to be submitted on July 28th, 2005 right of priority of the 10-2005-0069121 korean patent application of Korea S Department of Intellectual Property, and disclosing of this application is incorporated into this for reference.
Technical field
The total design of the present invention relates to a kind of fixation unit and a kind of image forming apparatus with this fixation unit, more particularly, relate to a kind of fixation unit that forms uniform fusing nip, produce flexural deformation and heat and pressure vertically are applied to uniform fusing nip equably along fixation unit by pressure roller by preventing.
Background technology
In image forming apparatus, light is irradiated on the photosensitive drums that is filled with uniform electric charge to form predetermined sub-image, the described sub-image that forms on photosensitive drums is developed into visual image by toner is provided, then with the image transfer printing of developing and be fused on the printed medium to be printed.
In traditional fixation unit, two roller closely contacts each other, promptly, with heating source be included in wherein warm-up mill with by applying backer roll that predetermined pressure contacts with warm-up mill vertical formation fusing nip along them, and when the printing paper that toner image is arranged on it passed fusing nip, toner image was fused on printing paper.For the fusing nip of the fixing quality that obtains to be enough to guarantee to expect, should be increased in the size of two pressure spans (being fusing nip) between the roller.If the diameter of backer roll increases for this reason, then the size of fixation unit and weight also will increase.Therefore the image forming apparatus that has fixation unit like this becomes huge, thereby its material cost also rises.Therefore, restricted at increase backer roll diametrically.Except the method that increases the fusing nip size, also can increase the elastic pressure that backer roll is pressed onto the spring on the warm-up mill.Because the elastic pressure that increases, backer roll may crooked and distortion yet in this case.Like this, the size of fusing nip vertically becomes big along backer roll in the center of pressure roll, and does not have sufficient pressure to be applied to the center, has caused toner-particle can not fully be fused to problem on the printing paper like this.
In recent years, two backer rolls have been developed along the periphery of the warm-up mill fixation unit of the structure of Contact Heating roller sequentially with relative minor diameter.The advantage that exists is that by little backer roll is set, fixation unit seldom is restricted, and can increase fully by the size that a plurality of backer roll fusing nip are set on size or weight.Yet the rigidity of backer roll is along with its size reduces and variation, so backer roll becomes seriously crooked and is out of shape.
Fig. 1 is the view that the backer roll of distortion is shown, and has exaggerated the state that is out of shape among Fig. 1 for the purpose of convenient.With reference to Fig. 1, elastic force F is applied to the two ends of backer roll 10 so that backer roll 10 Contact Heating roller 30 closely, thus backer roll 10 crooked and distortion.More particularly, along its vertical variation gradually to its center, and sweep C is formed on the center of backer roll 10 to the contact between backer roll 10 and the warm-up mill 30 from an end of backer roll 10.In this case, inequality becomes along the Width of printing paper (with warm-up mill 10 vertical corresponding) for heating and pressure condition, this has caused hypopexy, and therefore fixing required sufficient heat and pressure are not delivered to the sweep C that forms in the center of backer roll 10.As a reference, the flexural deformation of backer roll 10 can be quantized into vertical range e, and e measures by the vertically sweep C from the one end to center section along backer roll 10.For example, can be approximated to be 0.117mm apart from e.Except causing the printing quality difference, the excessive elastic force that is applied to the end of warm-up mill 30 and backer roll 10 shortens the term of life of the whole fixation unit that comprises warm-up mill 30.
Summary of the invention
General plotting of the present invention provides a kind of fixation unit and has had the image forming apparatus of this fixation unit, and this fixation unit prevents the distortion of backer roll, thereby can form uniform fusing nip between warm-up mill and backer roll.
The others of general plotting of the present invention and an advantage part are set forth in description, and a part becomes apparent from describe, and perhaps can understand by the practice to general plotting of the present invention.
Above-mentioned and/or the others of general plotting of the present invention and effect can realize by a kind of fixation unit is provided, by heat and pressure are applied on the printed medium with toner image, this fixation unit is incorporated into the toner image hot melt on the printed medium, described fixation unit comprises: warm-up mill comprises thermal source; One or more backer rolls contact with warm-up mill; Elastic body flexibly is applied to pressure towards warm-up mill the both ends of described one or more backer rolls; One or more reinforcement parts closely contact with the center section of corresponding backer roll, to press the center section of described backer roll partly towards warm-up mill; One or more reinforcement elastic bodys are flexibly pressed in the described reinforcement parts corresponding one towards warm-up mill.
Described one or more backer roll can comprise sequentially a plurality of backer rolls that closely contact along the excircle of warm-up mill and warm-up mill.
Described one or more reinforcement parts have arch section, with at least a portion of the external peripheral surface that covers corresponding backer roll.
The line that described one or more reinforcement elastic body is joined to one another along the axle center with the axle center of warm-up mill and corresponding backer roll is arranged, to provide elastic force along described line towards warm-up mill.
Described one or more reinforcement parts comprise lug, described lug is inserted on it regularly from first side-prominent and described one or more reinforcement elastic body of described one or more reinforcement parts, and described first side is opposite with second side of described one or more reinforcement parts of the corresponding backer roll of contact.
Described one or more reinforcement parts comprise releasing layer, and described releasing layer contacts slidably with corresponding backer roll.
At least one end that covers described one or more reinforcement parts of corresponding backer roll is round.
Above-mentioned and/or the others of general plotting of the present invention and effect can realize by a kind of image forming apparatus with fixation unit is provided, this fixation unit is transferred to toner image on the printed medium, and this fixation unit with the hot photographic fixing of toner image of transfer printing to printed medium, this fixation unit comprises: warm-up mill comprises thermal source; One or more backer rolls closely contact with warm-up mill; Elastic body flexibly is applied to pressure towards warm-up mill the both ends of described one or more backer rolls; The reinforcement parts closely contact with the center section of corresponding described one or more backer rolls, to press the center section of described backer roll partly towards warm-up mill; The reinforcement elastic body is flexibly pressed corresponding reinforcement parts towards warm-up mill.
Above-mentioned and/or the others of general plotting of the present invention and effect can by provide a kind of in the fixation unit of image forming apparatus spendable presser unit realize, described presser unit comprises: at least one backer roll, will be exerted pressure by the printing sheets of the image of photographic fixing to having; Support unit supports described at least one backer roll rotationally, and provides first elastic force to described at least one backer roll; Press member, corresponding with each backer roll and along the longitudinal extension of corresponding backer roll and be in contact with it, to provide second elastic force to corresponding backer roll.
Described support unit provides first elastic force to the first end and the second end of described at least one backer roll, and described press member provides second elastic force to the center section of corresponding backer roll.Described support unit comprises: first axle bush, support the first end of described at least one backer roll rotationally, and flexibly setover towards described at least one backer roll; Second axle bush supports the second end of described at least one backer roll rotationally, and flexibly setovers towards described at least one backer roll; Link is connected to each other first axle bush and second axle bush.Support unit can be a monolithic construction.Support unit can comprise the elastic component that first elastic force is provided, and press member can comprise at least one press member that corresponding backer roll is provided second elastic force.Described at least one backer roll can be single backer roll.Support unit can be along the direction by the line of the extension of central axis of described at least one backer roll provides first elastic force to described at least one backer roll from the center of support unit, and press member can provide second elastic force to corresponding backer roll along described direction.
Above-mentioned and/or the others of general plotting of the present invention and effect can by provide a kind of in the fixation unit of image forming apparatus spendable presser unit realize, described presser unit comprises: first backer roll, will be exerted pressure by the printing sheets of the image of photographic fixing to having; First press member contacts along the longitudinal extension of first backer roll and with first backer roll, slidably to provide first elastic force to first backer roll; Second backer roll is exerted pressure to printing sheets; Second press member contacts along the longitudinal extension of second backer roll and with second backer roll, slidably to provide second elastic force to second backer roll; Support unit rotatably supports first backer roll and second backer roll, and provides the 3rd elastic force and the 4th elastic force to first backer roll and second backer roll respectively towards warm-up mill.
The 3rd elastic force can equal the 4th elastic force.Support unit can provide the 3rd elastic force and the 4th elastic force along first direction, first direction is along the first-line direction from extending between support unit and first backer roll and second backer roll and with the equidistant position of first backer roll and second backer roll, first press member can provide first elastic force along second direction, second direction is to form the second-line direction of first angle along the extension of central axis by first backer roll and with first line, second press member can provide second elastic force along third direction, and third direction is to form the three-way direction of second angle along the extension of central axis by second backer roll and with first line.First angle and second angle can equate.
Above-mentioned and/or the others of general plotting of the present invention and effect can by provide a kind of in image forming apparatus spendable fixation unit realize, this fixation unit comprises the presser unit that heat is applied to the warm-up mill on the printed medium that has image thereon and printed medium is exerted pressure, this presser unit comprises: at least one backer roll, will be exerted pressure by the printing sheets of the image of photographic fixing to having; Support unit supports described at least one backer roll rotationally, and provides first elastic force to described at least one backer roll; Press member, corresponding one longitudinal extension and contact slidably with it in described at least one backer roll is to provide another elastic force to corresponding backer roll.
Described at least one backer roll can be single backer roll.Described at least one backer roll can comprise first backer roll and second backer roll, and presser unit can comprise: first press member, contact slidably along the longitudinal extension of first backer roll and with it, and provide first elastic force to first backer roll; Second press member, along the longitudinal extension of second backer roll and with the contacting of its slip, provide second elastic force to second backer roll, wherein, support unit rotatably supports both of first backer roll and second backer roll, and provide the 3rd elastic force to first backer roll, provide the 4th elastic force second backer roll.
Above-mentioned and/or the others of general plotting of the present invention and effect can by provide a kind of in image forming apparatus spendable fixation unit realize that this fixation unit comprises: belt, transmit the printed medium comprise image and pass described fixation unit; Heating unit in first side of belt, offers printed medium with the photographic fixing image with heat; Presser unit is pressed belt towards heating unit.Described presser unit comprises: first backer roll, press the first of belt towards the first of warm-up mill, between first backer roll and warm-up mill, to form the first photographic fixing zone; First press member provides first elastic force towards warm-up mill to first backer roll; Second backer roll is pressed the second portion of belt towards the second portion of warm-up mill, to form the second photographic fixing zone between second backer roll and warm-up mill; Second press member provides second elastic force towards warm-up mill to second backer roll; Support unit rotatably supports first backer roll and second backer roll, and provides the 3rd elastic force and the 4th elastic force to first backer roll and second backer roll respectively towards warm-up mill.
Description of drawings
By the description of with reference to the accompanying drawings embodiment being carried out, these of general plotting of the present invention and/or others and advantage will become apparent and be more readily understood, wherein:
Fig. 1 is the view that traditional backer roll of crooked and distortion is shown;
Fig. 2 shows the structure of the image forming apparatus of the embodiment of general plotting according to the present invention;
Fig. 3 is the decomposition diagram that the fixation unit of the image forming apparatus of Fig. 2 of the embodiment of general plotting according to the present invention is shown;
Fig. 4 is the rear view that the fixation unit of Fig. 3 is shown;
Fig. 5 is the cut-open view that the fixation unit of cutting open along the V-V line of Fig. 4 is shown;
Fig. 6 is the view of supporting construction that the fixation unit of Fig. 3 is shown;
Fig. 7 is the decomposition diagram that the fixation unit of another embodiment of general plotting according to the present invention is shown;
Fig. 8 is the cut-open view of the fixation unit that comprises belt that the embodiment of the general plotting according to the present invention is shown.
Embodiment
Now, will describe the embodiment of general plotting of the present invention in detail, its example is shown in the drawings, and wherein, identical label will be represented identical parts all the time.Embodiment is described to explain general plotting of the present invention hereinafter with reference to accompanying drawing.
Fig. 2 is the synoptic diagram of structure that the fixation unit 200 of the embodiment of general plotting according to the present invention is shown and has the image forming apparatus 100 of this fixation unit 200.With reference to Fig. 2, image forming apparatus 100 comprises the outward appearance and the casing 101 that comprises its structural member that form image forming apparatus 100, is arranged in casing 101 with fixation unit 200 that will be formed on the image fixing on the printed medium and the image formation unit that forms image on printed medium.In Fig. 2, image formation unit comprises illuminator 120, developer 110 and transfer roll 130.
Illuminator 120 (strafe unit (LSU) form predetermined sub-image when shining light signal L on the photosensitive drums 112 along sweep trace by example laser as shown in Figure 2.Developer 110 comprises: photosensitive drums 112, and sub-image is formed on the external peripheral surface of photosensitive drums 112 owing to illuminator 120; Charging roller 114 is to photosensitive drums 112 chargings; Developer roll 113 offers sub-image on photosensitive drums 112 with toner; Unnecessary toner clearer 116 after toner is transferred on the printed medium, is removed the unnecessary toner that rests on the photosensitive drums 112.With being included in THICKNESS CONTROL that toner in the box 111 offers the donor rollers 115 of developer roll 113 and will be attached to the toner on developer roll 113 surfaces is that the doctor 119 of predetermined thickness is arranged round developer roll 113.Simultaneously, agitation of toner is arranged in the box 111 that comprises toner to prevent the caked stirrer 117 of toner.
The toner image that the transfer roll 130 that contacts with photosensitive drums 112 owing to predetermined pressure will form on photosensitive drums 112 is transferred on the printed medium, and this printed medium passes through between photosensitive drums 112 and transfer roll 130.In Fig. 2, label P represents the transfer printing path of printed medium.Printed medium is stored in the paper feeding box 140, many is picked up by pick-up roller 141, is provided for transfer roll 130 then after by paper aligner 143.Along with the operation of paper feeding, paper aligner 143 is aimed at so that toner image is transferred on the desired region of printed medium printed medium.
In the time of between printed medium is by warm-up mill 230 and first backer roll 210 and second backer roll 220, the fixation unit 200 that comprises warm-up mill 230, backer roll 210 and 220 allows toner images by predetermined thermal and pressure heat fusion, and described backer roll 210,220 is Contact Heating roller 230 and along the direction rotation opposite with the sense of rotation of warm-up mill 230 closely.So, the printed medium with image of process photographic fixing is delivered to casing 101 outsides by a pair of paper-feed roll 160, and printed medium is stacked on the paper discharge tray 102 then.
Fig. 3 is the decomposition diagram of fixation unit 200 that the image forming apparatus 100 of Fig. 2 of the embodiment of general plotting according to the present invention is shown.Fixation unit 200 in the present embodiment comprises warm-up mill 230 and the backer roll assembly 280 that faces with each other.Backer roll assembly 280 comprises first backer roll 210 of tight Contact Heating roller 230 and the axle bush 250 of second backer roll 220 and support backer roll 210 and 220.
Warm-up mill 230 is supported on (see figure 1) in the casing 101 rotationally by the bearing 235 that is provided with at its two ends, is arranged at least one end of warm-up mill 230 with the gear (not shown) of rate of doing work transmission member.Warm-up mill 230 is driven with constant rotational speed by the power transmission member.When warm-up mill 230 rotations, because the rotation of warm-up mill 230, the backer roll 210 and 220 that contacts with warm-up mill 230 also rotates.Though only have two backer rolls 210 and 220 to be arranged in the fixation unit 200 of the embodiment shown in Fig. 2, the fixation unit 200 of general plotting of the present invention can comprise contact with the external peripheral surface of warm-up mill more than two backer roll.And the fixation unit 200 of general plotting of the present invention can comprise the backer roll that only has to contact with the external peripheral surface of warm-up mill.In addition, though the power transmission member is set on the warm-up mill 230 as mentioned above, the power transmission member can be arranged on first backer roll and/or second backer roll 220.
Fig. 4 is the rear view that the fixation unit 200 of Fig. 3 is shown.With reference to Fig. 4, backer roll 210 and 220 is rotatably supported by axle bush 250, and connecting elements 270 is bonded to each other opposed facing a pair of axle bush 250, and connecting elements 270 penetrates axle bush 250 and extends abreast with backer roll 210 and 220.Outwards give prominence to the end that penetrates the connecting elements 270 of axle bush 250, and can be hinged by the clamp structure (not shown) that is arranged on the casing 101, thereby connecting elements 270 can become the rotation center of backer roll assembly 280.Lug 257 is back side-prominent from axle bush 250, and elastic body 261 fixedly inserted into wherein.Elastic body 261 is arranged between the inwall (not shown) and axle bush 250 of casing 101, and axle bush 250 is pressed to the warm-up mill 230 of more close casing 101 front sides.Therefore, place the backer roll 210 and 220 of axle bush 250 to be pressed towards warm-up mill 230.The pressure that applies between backer roll 210 and 220 and distribute changes significantly according to the position of lug 257, if but lug 257 is arranged to separate the distance that equates substantially with each of backer roll 210 and 220, then between backer roll 210 and 220, apply and the pressure that distributes equal substantially.
Simultaneously, along backer roll 210 and 220 center section longitudinally, face backer roll 210 and 220 from the reinforcement parts 217 and 227 that the rear side of backer roll 210 and 220 is flexibly exerted pressure to them, and respectively with the external peripheral surface sliding contact of backer roll 210 and 220, thereby backer roll 210 and 220 rotations and can not be subjected to the obstruction of reinforcement parts 217 and 227." sliding contact " is meant and contacts with parts and do not hinder the rotation of parts
The lugs 243 that reinforcement elastic body 263 and 265 inserts wherein are arranged on reinforcement parts 217 and 227, back side-prominent from reinforcement parts 217 and 227. Reinforcement parts 217 and 227 each backer roll 210 and 220 is pressed to warm-up mill 230 respectively, more particularly, press to the axis of warm-up mill 230.Therefore, as shown in Figure 4, the first reinforcement elastic body 263 closely contacts with the upside of the external peripheral surface of backer roll 210, provides first backer roll 210 to the elastic force that presses down.Similarly, as shown in Figure 4, the second reinforcement elastic body 265 closely contacts with the downside of the external peripheral surface of backer roll 220, and the elastic force that second backer roll 220 is upwards pushed up is provided.To describe in more detail after a while.The backer roll 210 of the embodiment of general plotting of the present invention with 220 by being pressed towards warm-up mill 230 with the axle bush 250 that 220 two ends closely contact with backer roll 210, simultaneously, by pressing to warm-up mill 230 with the reinforcement parts 217 and 227 that backer roll 210 contacts with 220 center section respectively.
Fig. 5 is the cut-open view that the fixation unit of the Fig. 3 that cuts open along the V-V line of Fig. 4 is shown.With reference to Fig. 5, first backer roll 210 and second backer roll 220 are along the sequentially tight Contact Heating roller 230 of excircle of warm-up mill.Warm-up mill 230 can be included in heating source 237 wherein, heat is applied to toner-particle is transferred on the printed medium on it.Heating source can be, but be not limited to Halogen lamp LED, heated filament or induction heater.Warm-up mill 230 can be included in the pipe 233 that wherein has cavity, and the external peripheral surface of warm-up mill can coated releasing layer 231.Releasing layer 231 can be formed on the outmost surface of warm-up mill 230, thereby can realize the stalling characteristic of the toner-particle expected.Releasing layer 231 can be made by the cured of for example heat resistant type.
One or two backer rolls 210 and 220 that closely contact with warm-up mill 230 can comprise: metal drum 215, and formation constitutes the framework of the kernel of backer roll; Elastic layer 213 is formed on the external peripheral surface of metal drum 215; Releasing layer 211 is coated on the external peripheral surface of elastic layer 213.Elastic layer 213 can be made by the resilient material of for example polyurethane or silicones.If expectation, elastic layer 213 can all form on backer roll 210 and 220 two.Selectable, if expectation, elastic layer 213 can only be formed on backer roll 210 and 220 on one of them or do not form on backer roll 210 and 220.When backer roll 210 when 220 closely contact with warm-up mill 230, the first fusing nip N1 and the second fusing nip N2 be respectively formed at two backer rolls 210 and 220 and warm-up mill 230 between, backer roll 210 and 220 elastic layer 213 head on warm-up mill 230 and are compressed.When printed medium passed through the first fusing nip N1 and the second fusing nip N2, the toner-particle that is attached on the printed medium was firmly fused on printed medium by predetermined heat and pressure.As shown in Figure 5, the fixation unit 200 of general plotting embodiment of the present invention uses two backer rolls 210 and 220, to obtain minimum fixation unit and fusing nip N1 and the N2 that guarantees to have sufficient length.Yet, in different embodiment, can use single backer roll or more than two backer roll.Releasing layer 211 can be formed on the external peripheral surface of elastic layer 213, and releasing layer 211 allows toner-particles to separate from the external peripheral surface of releasing layer 211, and not attached to it, and is similar with the releasing layer 231 of warm-up mill 230.
Simultaneously, the reinforcement parts 217 that oppressed and backer roll 210 contacted and covered the external peripheral surface part of backer roll 210 can comprise releasing layer 218, the surface in contact that this releasing layer 218 forms between arc main frames 219 and the backer roll 210.When backer roll 210 rotations, releasing layer 218 allows reinforcement parts 217 to contact backer roll 210 slidably and prevents unnecessary interruption.Releasing layer 218 can be made by the material of for example heat-resisting cured type, and the width of releasing layer 218 can be about 500 μ m to about 700 μ m.For example, releasing layer 218 can be thicker than relatively and have the releasing layer 211 of about 200 μ m to the thickness of about 300 μ m.
In the fixation unit 200 of Fig. 5, first backer roll 210 and second backer roll 220 are relative to each other arranged symmetrically in a horizontal side separately, and have identical diameter, thereby during use, equate with angle θ 1 and the θ 2 that the axle center C3 of warm-up mill 230 forms by axle center C1 and C2.Yet in another embodiment, angle θ 1 and θ 2 can be different.The reinforcement elastic body of arranging towards the axle center C3 of warm-up mill 230 263 and 265 is being effectively aspect the compressing backer roll 210 and 220, and the middle part of backer roll 210 and 220 is oppressed partly with tight Contact Heating roller 230.
Simultaneously, if form sharp edges, contact with the reinforcement parts then that the backer roll 210 and 220 that rotates can be damaged or its operation can be hindered at the marginal portion of reinforcement parts 217 and 227 m.In order to prevent this situation, as shown in Figure 5, the marginal portion m of reinforcement parts 217 can be circle, thereby can prevent the unnecessary interruption between backer roll 210 and reinforcement parts 217.
Fig. 6 is the synoptic diagram of supporting construction that the fixation unit 200 of Fig. 3 is shown.Be described in the function of the reinforcement elastic body 263 that uses among the various embodiment of general plotting of the present invention hereinafter with reference to Fig. 6.Usually, there is such problem, because the axle sleeve at the both ends of compressing backer roll 210, backer roll 210 crooked and distortion, and because the center section of distortion backer roll 210 forms sweep C, therefore Contact Heating roller fully closely causes fixing performance variation (see figure 1).In the embodiment of general plotting of the present invention, reinforcement elastic body 263 passes through the elastic force F of elastic body 263 at the center section of backer roll 210
2Exert pressure partly, and use with the elastic body 261 of axle bush 250, this axle bush 250 passes through the elastic force F of elastic body 261 at the both ends of backer roll 210
1Exert pressure (seeing Fig. 3 and Fig. 4), thereby backer roll 210 is not crooked, and can be along the uniform fusing nip of vertical formation of backer roll 210.
Simultaneously, compressing can be than preventing that the necessary length of flexural deformation is long with the length L of the reinforcement parts 217 of contact backer roll 210.By increasing the length L of reinforcement parts 217, can prevent the distortion of backer roll 210 effectively, yet, when extending to, reinforcement parts 217 surpass when preventing the required length of flexural deformation, the redundance of reinforcement parts 217 causes the waste of material, thereby wishes suitably to control the length of reinforcement parts.
The scope of general plotting of the present invention is not limited to have the fixation unit more than two backer rolls, but also comprises the fixation unit with single backer roll.For example, as shown in Figure 7, the fixation unit 300 of the embodiment of general plotting can comprise a backer roll 310 according to the present invention.Fixation unit 300 shown in Fig. 7 comprises: warm-up mill 330, contain the heating source (not shown); Backer roll assembly 380 closely contacts with warm-up mill 330; Bearing 335.Backer roll assembly 380 comprises: single backer roll 310 closely contacts with warm-up mill 330; A pair of axle bush 350 in each end of backer roll 310, is used to make backer roll 310 closely to contact with warm-up mill 330.For example, by from the front side of axle bush 350 to the rear side of axle bush 350 hollow out predetermined depth axle bush 350 form positioning recess 350 '.Axle 310a form the two ends of backer roll 310 and can insert positioning recess 350 ' in.In case with backer roll 310 place positioning recess 350 ', the journal bearing 341 axle 310a that can be inserted into then at the both ends of backer roll 310, journal bearing 341 supports the rotation of backer rolls 310, and between backer roll 310 and axle bush 350.A pair of axle bush 350 supports the both ends of backer roll 310 and is connected to each other to support each other by connecting elements 370, and this connecting elements 370 has the two parts that extend in parallel with backer roll 310 respectively at the upside and the downside of backer roll 310.Though Fig. 7 shows as a pair of axle bush 350 of separated structures and connecting elements 370, axle bush 350 and connecting elements 370 can form an one-piece construction.
Axle bush 350 is owing to flexibly setover to backer roll 310 at the elastic body 361 of its rear side, and forms lug 357 from the rear side of axle bush 350 is outstanding, thereby elastic body 361 can insert on the lug 357.Because cover the part of backer roll 310 excircles and the reinforcement parts 317 that closely contact with backer roll 310, the center section of backer roll 310 is vertically additionally pressed to warm-up mill 330 along it.Lug 343 is back side-prominent from reinforcement parts 317, and reinforcement elastic body 363 is inserted on the lug 343 regularly.Reinforcement elastic body 363 can flatly be positioned on the dotted line S, and this dotted line S is with the axle center C ' of warm-up mill 330
2Axle center C ' with backer roll
1Couple together, therefore, the center section of backer roll 310 can tight effectively Contact Heating roller 330.Do not have reinforcement elastic body 363, its two ends may crookedly also be out of shape by the backer roll 310 of axle bush 350 compressings, thereby undesirable bending can take place the center section of backer roll along the longitudinal.Therefore, reinforcement elastic body 363 is oppressed the center section of backer roll 310 partly, preventing the crooked and distortion of backer roll 310, and forms uniform fusing nip, pressure and heat vertically being applied in along backer roll uniformly in described fusing nip.
Fig. 8 is the cut-open view of the fixation unit that comprises belt 400 200 that the embodiment of the general plotting according to the present invention is shown.Fixation unit 200 is available in image forming apparatus, and comprises that heating unit, presser unit and belt 400, this belt 400 are used to transmit the printed medium that comprises image and pass fixation unit 200.Presser unit is oppressed belt towards heating unit.Heating unit can comprise warm-up mill 230.Presser unit can comprise first backer roll 210, the first reinforcement parts 217, second backer roll 220, second reinforcement parts 227 and the support unit, for example backer roll assembly 280 (see figure 4)s or 380 (see figure 7)s.
According to general plotting of the present invention, at fixation unit and having in the image forming apparatus of this fixation unit, prevented the crooked and distortion of the backer roll of formation fusing nip, and in fusing nip, thereby the problem that can avoid bad printing quality and/or term of life to reduce along vertical formation homogeneous condition of backer roll.In addition, prevent that the backer roll deformed configurations from can use together with the backer roll with relative minor diameter, thereby obtained fixation unit size that effectively reduces and the fusing nip of guaranteeing with abundant length.
Though shown and described several embodiment of general plotting of the present invention, but those skilled in the art should understand, under principle that does not break away from the scope of the present invention that limits by claim and equivalent thereof and spirit, can change these embodiments.
Claims (23)
1, a kind of fixation unit by heat and pressure are applied to the printed medium with toner image, is incorporated into the toner image hot melt on the printed medium, and described fixation unit comprises:
Warm-up mill comprises thermal source;
One or more backer rolls contact with warm-up mill;
Elastic body flexibly is applied to pressure the both ends of described one or more backer rolls towards warm-up mill;
One or more reinforcement parts closely contact with the center section of corresponding backer roll, to press the center section of described backer roll partly towards warm-up mill;
One or more reinforcement elastic bodys are flexibly pressed in the described reinforcement parts corresponding one towards warm-up mill.
2, fixation unit as claimed in claim 1, wherein, described one or more backer rolls comprise sequentially a plurality of backer rolls that closely contact along the excircle of warm-up mill and warm-up mill.
3, fixation unit as claimed in claim 1, wherein, described one or more reinforcement parts have arch section, with at least a portion of the external peripheral surface that covers corresponding backer roll.
4, fixation unit as claimed in claim 1, wherein, the line that described one or more reinforcement elastic bodys are joined to one another along the axle center with the axle center of warm-up mill and corresponding backer roll is arranged, to provide elastic force along described line towards warm-up mill.
5, fixation unit as claimed in claim 1, wherein, described one or more reinforcement parts comprise:
Lug inserts on it regularly from first side-prominent and described one or more reinforcement elastic body of described one or more reinforcement parts, and described first side is opposite with second side of described one or more reinforcement parts of the corresponding backer roll of contact.
6, fixation unit as claimed in claim 1, wherein, described one or more reinforcement parts comprise: releasing layer contacts slidably with corresponding backer roll.
7, fixation unit as claimed in claim 1, wherein, at least one end that covers described one or more reinforcement parts of corresponding backer roll is round.
8, fixation unit as claimed in claim 1 also comprises:
The axle bush device rotatably supports the two ends of described one or more backer rolls, and towards the described one or more backer rolls of heating roll-in;
Lug, opposite with described one or more backer rolls one side-prominent from the axle bush device plugged elastic body regularly on lug.
9, fixation unit as claimed in claim 8, wherein, described axle bush device comprises:
A pair of axle bush, corresponding with the end separately of described one or more backer rolls, each axle bush has from opposite with described one or more backer rolls one of axle bush side-prominent lug, and plugs elastic body on lug regularly;
Connecting elements is separated from each other described a pair of axle bush, and extends abreast to support described a pair of axle bush with backer roll.
10, a kind of image forming apparatus comprises:
Image formation unit is transferred to toner image on the printed medium;
Fixation unit, to printed medium, described fixation unit comprises with the hot photographic fixing of toner image of described transfer printing:
Warm-up mill comprises thermal source;
One or more backer rolls closely contact with warm-up mill;
Elastic body flexibly is applied to pressure towards warm-up mill the both ends of described one or more backer rolls;
The reinforcement parts closely contact with the center section of corresponding described one or more backer rolls, to press the center section of described backer roll partly towards warm-up mill;
The reinforcement elastic body is flexibly pressed corresponding reinforcement parts towards warm-up mill.
11, image forming apparatus as claimed in claim 10, wherein, described one or more backer rolls comprise sequentially a plurality of backer rolls that closely contact along the excircle of warm-up mill and warm-up mill.
12, image forming apparatus as claimed in claim 10, wherein, described reinforcement parts have arch section, with at least a portion of the external peripheral surface that covers corresponding backer roll.
13, image forming apparatus as claimed in claim 10, wherein, the line that described reinforcement elastic body is joined to one another along the axle center with the axle center of warm-up mill and corresponding backer roll is arranged, to provide elastic force along described line towards warm-up mill.
14, image forming apparatus as claimed in claim 10, wherein, described reinforcement parts comprise:
Lug is inserted on it regularly from the first side-prominent and described reinforcement elastic body of described one or more reinforcement parts, and described first side is opposite with second side of the reinforcement parts of the corresponding backer roll of contact.
15, image forming apparatus as claimed in claim 10, wherein, described reinforcement parts comprise: releasing layer contacts slidably with corresponding backer roll.
16, image forming apparatus as claimed in claim 10, wherein, at least one end that covers the described reinforcement parts of corresponding backer roll is round.
17, image forming apparatus as claimed in claim 10 also comprises:
The axle bush device rotatably supports the two ends of described one or more backer rolls, and towards the described one or more backer rolls of heating roll-in;
Lug, opposite with described one or more backer rolls one side-prominent from the axle bush device plugged elastic body regularly on lug.
18, image forming apparatus as claimed in claim 17 also comprises:
A pair of axle bush, corresponding with the end separately of described one or more backer rolls, each axle bush has from opposite with described one or more backer rolls one of axle bush side-prominent lug, and plugs elastic body on lug regularly;
Connecting elements is separated from each other described a pair of axle bush, and extends abreast to support described a pair of axle bush with backer roll.
19, a kind of in the stationary installation of image forming apparatus spendable presser unit, described presser unit comprises:
At least one backer roll will be exerted pressure by the printing sheets of the image of photographic fixing to having;
Support unit supports described at least one backer roll rotationally, and provides first elastic force to described at least one backer roll;
Press member, corresponding with each backer roll and along the longitudinal extension of corresponding backer roll and be in contact with it, to provide second elastic force to corresponding backer roll.
20, presser unit as claimed in claim 19, wherein,
Described support unit provides first elastic force to the first end and the second end of described at least one backer roll;
Described press member provides second elastic force to the center section of corresponding backer roll.
21, presser unit as claimed in claim 19, wherein, described support unit comprises:
First axle bush supports the first end of described at least one backer roll rotationally, and flexibly setovers towards described at least one backer roll;
Second axle bush supports the second end of described at least one backer roll rotationally, and flexibly setovers towards described at least one backer roll;
Link is connected to each other first axle bush and second axle bush.
22, a kind of in image forming apparatus spendable fixation unit, comprising:
Belt transmits the printed medium that comprises image and passes described fixation unit;
Heating unit in first side of belt, offers printed medium with the photographic fixing image with heat;
Presser unit is pressed belt towards heating unit, and described presser unit comprises:
First backer roll is pressed the first of belt towards the first of warm-up mill, to form the first photographic fixing zone between first backer roll and warm-up mill;
First press member provides first elastic force towards warm-up mill to first backer roll;
Second backer roll is pressed the second portion of belt towards the second portion of warm-up mill, to form the second photographic fixing zone between second backer roll and warm-up mill;
Second press member provides second elastic force towards warm-up mill to second backer roll;
Support unit rotatably supports first backer roll and second backer roll, and provides the 3rd elastic force and the 4th elastic force to first backer roll and second backer roll respectively towards warm-up mill.
23, fixation unit as claimed in claim 22, wherein, the length in the described first photographic fixing zone equates substantially with the length in the second photographic fixing zone.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020050069121A KR100644708B1 (en) | 2005-07-28 | 2005-07-28 | Fixing unit and image forming apparatus having the same |
| KR1020050069121 | 2005-07-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1904764A true CN1904764A (en) | 2007-01-31 |
Family
ID=37654291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101078973A Pending CN1904764A (en) | 2005-07-28 | 2006-07-27 | Fixing unit and image forming apparatus having the same |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US7421236B2 (en) |
| KR (1) | KR100644708B1 (en) |
| CN (1) | CN1904764A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103381701A (en) * | 2012-05-04 | 2013-11-06 | 施乐公司 | Transfix roller with adaptive center loading for use in an indirect printer |
| CN106249567A (en) * | 2015-06-12 | 2016-12-21 | 佳能株式会社 | Heater and image processing system |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080138003A1 (en) * | 2005-01-25 | 2008-06-12 | Samuel Tsui | Support Member For a Rotatable Element |
| JP4728690B2 (en) * | 2005-04-28 | 2011-07-20 | 京セラミタ株式会社 | Fixing device |
| KR100717010B1 (en) * | 2005-07-20 | 2007-05-10 | 삼성전자주식회사 | Fixing unit and image forming apparatus having the same |
| EP1785781B1 (en) * | 2005-11-14 | 2018-11-28 | HP Printing Korea Co., Ltd. | Image fixing apparatus |
| KR101484179B1 (en) * | 2006-12-07 | 2015-01-20 | 삼성전자주식회사 | Fusing device and image forming apparatus and method using the same |
| KR101145217B1 (en) | 2007-06-15 | 2012-05-25 | 삼성전자주식회사 | Fusing device and image forming apparatus having the same |
| JP5063385B2 (en) * | 2008-01-23 | 2012-10-31 | キヤノン株式会社 | Liquid coating apparatus and inkjet recording apparatus |
| KR20120066384A (en) * | 2010-12-14 | 2012-06-22 | 삼성전자주식회사 | Fixing apparatus and image forming apparatus having the same |
| US10440503B2 (en) * | 2014-07-16 | 2019-10-08 | TUPL, Inc. | Machine learning-based geolocation and hotspot area identification |
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| US4799085A (en) * | 1986-04-03 | 1989-01-17 | Fuji Photo Film Co., Ltd. | Image recording apparatus and method |
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| US4965623A (en) * | 1987-01-30 | 1990-10-23 | Fuji Photo Film Co., Ltd. | Image recording apparatus and method |
| JPH05165361A (en) * | 1991-12-17 | 1993-07-02 | Matsushita Electric Ind Co Ltd | Fixing device |
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| JP3396102B2 (en) * | 1995-01-11 | 2003-04-14 | 京セラミタ株式会社 | Pressure roller support structure |
| JPH0944030A (en) | 1995-07-29 | 1997-02-14 | Katsuragawa Electric Co Ltd | Heat roller type fixing device |
| JP3218941B2 (en) * | 1995-08-31 | 2001-10-15 | 富士ゼロックス株式会社 | Fixing device |
| JPH0990791A (en) | 1995-09-28 | 1997-04-04 | Nec Corp | Fixing device |
| JPH09171321A (en) | 1995-12-19 | 1997-06-30 | Ricoh Co Ltd | Fixing device for electrophotographic recorder |
| JP2000089601A (en) | 1998-09-09 | 2000-03-31 | Canon Inc | Image thermal fixing device |
| JP2000122441A (en) * | 1998-10-21 | 2000-04-28 | Fuji Xerox Co Ltd | Image forming device, transfer-fixing device, and method for forming image |
| JP2002123119A (en) | 2000-10-18 | 2002-04-26 | Canon Inc | Fixing device and image forming device |
| JP4123992B2 (en) * | 2003-03-14 | 2008-07-23 | ブラザー工業株式会社 | Thermal fixing device and image forming apparatus |
| KR100547134B1 (en) * | 2003-07-11 | 2006-01-26 | 삼성전자주식회사 | A Fusing unit for dry type color laser printer |
| KR100580222B1 (en) * | 2005-05-12 | 2006-05-16 | 삼성전자주식회사 | Fixing unit and image forming apparatus with the same |
| KR100717010B1 (en) * | 2005-07-20 | 2007-05-10 | 삼성전자주식회사 | Fixing unit and image forming apparatus having the same |
| JP2007034170A (en) * | 2005-07-29 | 2007-02-08 | Kyocera Mita Corp | Fixing device |
-
2005
- 2005-07-28 KR KR1020050069121A patent/KR100644708B1/en not_active IP Right Cessation
-
2006
- 2006-07-11 US US11/483,588 patent/US7421236B2/en not_active Expired - Fee Related
- 2006-07-27 CN CNA2006101078973A patent/CN1904764A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103381701A (en) * | 2012-05-04 | 2013-11-06 | 施乐公司 | Transfix roller with adaptive center loading for use in an indirect printer |
| CN103381701B (en) * | 2012-05-04 | 2016-06-08 | 施乐公司 | It is used in the transfer roll with adaptability intermediate loads in indirect printing machine |
| CN106249567A (en) * | 2015-06-12 | 2016-12-21 | 佳能株式会社 | Heater and image processing system |
| CN106249567B (en) * | 2015-06-12 | 2020-01-03 | 佳能株式会社 | Heating device and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| US20070025783A1 (en) | 2007-02-01 |
| US7421236B2 (en) | 2008-09-02 |
| KR100644708B1 (en) | 2006-11-10 |
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